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【題目】What puzzles me most is why so many students bury themselves in piles of maths exercises _________they should spare some time to reflect on their previous mistakes.

A. once B. unless

C. when D. though

【答案】C

【解析】

考查連詞辨析。句意：最讓我不理解的就是為什么會有那么多的學生本該花些時間反思自己以前的錯誤的時候卻在那里埋頭于大量的數學練習題。分析句子的結構可知，本句為when引導時間狀語從句，表示該反思自己以前的錯誤的時候，前面的主語為what引導的主語從句；故選C。

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